package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.log4j.Log4j2;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面类，用于设置创建人、创建时间、修改人、修改时间等公共字段
 */
@Component
@Aspect
@Log4j2
public class AutoFillAspect {
    /**
     * @Before语句：用于扫描包并判断接口那些方法上有AutoFill注解
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointcut(){}

    @Before("autoFillPointcut()")
    public void info(JoinPoint joinPoint){
        log.info("开始进行公共字段自动填充....");
        //获取被拦截方法的类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();  //获得签名对象
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);  //获得方法上的注解
        OperationType operationType= annotation.value();
        //获取被拦截方法的参数
        Object[] args = joinPoint.getArgs();
        if (args.length==0){
            return;
        }
        Object arg = args[0];
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据当前不同的操作类型，为对应的属性通过反射赋值
        if (operationType.equals(OperationType.INSERT)){
            try {
                Method setCreateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(arg,now);
                setCreateUser.invoke(arg,currentId);
                setUpdateTime.invoke(arg,now);
                setUpdateUser.invoke(arg,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }else{
            try {
                Method setUpdateTime = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setUpdateTime.invoke(arg,now);
                setUpdateUser.invoke(arg,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }
}
